G540 motor controller into a Zen Toolworks CNC

After reading all the G540 topics in the forum I am still confused. Is there anyway to use Easel to control my Zen Toolworks CNC with a G540 motor controller without an additional interface? Thanks in advance for any help. If an interface is needed what type? If G540 is not a viable controller what would be the next best thing to use for a direct interface between Easel and my Zen Toolworks machine?

That is pretty much what I had figured out but was hoping there was some type of interface for the G540 that would allow me to use Easel directly into my CNC. LinuxCNC is OK but Easel looks much easier. Thanks for the quick reply.